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(No Model.)

E. DBPP. MIXED AIR AND STEAM ENGINE AND GENERATOR.

No. 521,762. Patented June 19, 1894.

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UNITED TATES E I E.

ATENT H'EZEKIAH E. DEPP, 0F SEDALIA, MIssoURI, ASSIGNOR TO OLIVIARITOHES O SAME PLACE.

MIXEDAIR AND STEAM ENGINE AND GENERATOR.

4 PEGIFIGATION forming part of Letters Patent No. 521,762, dated June19,1894.

Application filed October 28, 1893.

To all whom it may concern.-

Be it known that I, HEZEKIAH'E. DEPP, acitizen of the United States,residing at Sedalia, in the county of Pettis and State of Missouri, haveinvented certain new and useful Improvements in Mixed Air and SteamEngines and Generators; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to improvements in devices for feeding air andwater to steam boilers, and its objects are, first, to supply compressedair and water, having first heated them to the temperature of theexhaust from the main engine, to the boiler; second, to utilize theexhaust steam for such heating, and third, to use the live steam on itsway to the engine to operate the air compressor or pump. 7 I accomplishthese objects by the peculiar construction and combinations of deviceshereinafter more particularly described and claimed,

In the accompanying drawing forming part of this specification, thefigure represents a side elevation of the devices embodied in myinvention.

The live steam pipe at, leading from the steam domeof an ordinaryhorizontal, tubular boiler, has connection with the engine B by a branchpipe b and with the steam chest 0 of the cylinder D, by pipe I). Thepump E is operated by the cylinder D and is pro-- vided with air andWater inlets. The pipe 6 leading from said pump E receives andcompresses air and water and conveys them to the boiler into which theyare discharged. An exhaust pipe f connected to the engine dischargesinto a steam box]? which is provided with an ordinary exhaust pipe. Thepipe 6 from the air compressor enters this box at one end and passestherethrough on its way to the boiler, thus the contents of said pipeare heated to the temperature of the exhaust steam from the mainengineand when discharged into the boiler will not cause the condensation ofthe steam as they otherwise would. The steam that exhausts from theengine will not be equal in temperature to the steam in the boiler butthe heat Serial No. 489,425. (No model.)

caused by the compression of the air in the air compressor and absorbedby the water therein will be sufficient in'add'ition, to raise thetemperature of the air and water to the 0. An exhaust pipe f from saidcylinder communicateswith the supply pipe I) of the engine, thusconducting the exhaust of said cylinder to the engine. A branch pipe Jconnects this exhaust pipe f with the exhaust pipe f so that, ifdesirable, the exhaust from cylinder D can be turned into the steam boxFby opening cock J, and thus the compressor could be operated withoutthe main engine when so desired. A governor H is mounted in the branchpipe b and is connected with the shaft of the fly wheel bya belt h andbelt wheels 72/. 'Acock b is placed in the supply pipe of the cylinder Dand a cock b in the supply pipe of the engine to regulate the flow ofsteam to each respectively. A cook a is also provided to regulate theflow of steam from the steam dome into pipe a. The air compressorcylinder as before mentioned has a suitable water supply pipe is so thatthe water may act as a lubricant to the air cylinder while under highpressure. This pipe has a cook it which controls the supply. A pipe Zprovided with a regulating cock Z is connected to the pipe e anddischarges into the heating space surrounding the boiler, thus allowingcompressed air to be supplied to aid combustion if desired.

For low pressure the air can be compressed without Water and lubricatedwith oil, but for high pressure water must be used. I prefer water as ithelps to supply the boiler with water.

The operation of the devices is as follows: Live steam passes from thesteam dome through pipe at and branch pipesb and b'an'd simultaneouslystarts the air pump and the engine. The compression of the air in theair pump or compressor causes considerable heat which is taken up orabsorbed by the water admitted to said pump. This heated water and airpass through pipe e which is heated by the exhaust steam in the steambox F as before described. The exhaust steam from cylinder D passes bypipe f to pipe I) and thus tothe engine B. By this arrangement the steamthat is used to operate the pump is not wasted, but used again in theengine B. The engine though, is not altogether dependent on the cylinderexhaust for its supply of steam as branch pipe b supplies it with steamdirectly from the boiler, but this only when the pump is at rest ormoving slowly. By placing the governor in the pipe I) I regulate thesupply of steam so that when the pump is working its full capacity thegovernor Will close pipe b and cause all the supply for the engine tofirst pass through the cylinder D. It will thus be seen that the enginealways has the same pressure of steam, said steam sometimes passingthrough both the pipe I) and the cylinder D, and sometimes through thepipe alone or the cylinder alone according to Whether the cylinder is inoperation or not.

By my invention a great saving of fuel is accomplished as the force usedin running the air compressor or pump is not lost but is returned to theboiler in the shape of highly heated and compressed air. It will be seenfrom the foregoing description that the chief element used to accomplishthe desired saving of fuel is heated and compressed air. It has beenproven in practice that airsupplied in such a way has a very decidedadvantage in preventing condensation of steam. It has been alsosuccessfully demonstrated that aereated steam is much more effectivethan steam alone as it has a much more lively action.

The supply pipe I), which receives the supply of live steam directlyfrom the boiler and also the exhaust from the pump engine, has the usualgovernor B placed therein to govern the supply of steam and consequentlythe speed of the engine.

What I claim as my invention is- 1. The combination with a steam boiler,of an engine, steam connection from said engine to said boiler, an aircompressor introduced in said connection and discharging into theboiler, a steam discharge from said compressor to said engine, and agovernor operated by said compressor and placed in the supply pipe ofsaid engine, substantially as described.

2. The combination with a steam boiler, of an air compressor actuated byand discharging into the same, an engine, steam connection between saidengine and said compressor and between said boiler and engine, agovernor regulating the supply of steam from the boiler to the engineand operated by the compressor, and a steam exhaust heating the airsupplied to the boiler from the compressor, substantially as described.

In testimony whereof I hereunto affix my signature in presence of twowitnesses.

HEZEKIAII E. DEPP.

Witnesses:

J. E. RITCHEY, E. 0. Mason.

